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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63a12e1bc32c3405f517f3f5c6db98254e3d1d7e569995bb20c82cdf5fd68583' 
  AND token = '8hCNDQywPg4n38c80RhS/6IbhmUttGnEmnVfz+S1qJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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