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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da075bca8dd70dbf2026eac0533d6ae327622fc0825ea6f62b8b4cfe08e31525' 
  AND token = 'IGKtWq3236XJxzKn7/tdHCOzQV+UEmrFH+iKrzMTU48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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