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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2f9dbcb5232e8cfd8b000156209e130b62f13bf55eba44769798820ff99d8af' 
  AND token = 'cvycfZdlAWiP6u04ajGFj3cFpxZfyHXaW+r7ehWjiQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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