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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46c90f88563dd7b4d6788ad5ec8aead023b48282a710d22d8ecc1dee75039886' 
  AND token = 'hXMk1XKZ8ZbfdIV91cthsR+vEvxYfRJOlZQe/mbHBeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00086

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}