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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0888f3451337e3ab8a3bacd210b4bf30287959de1bc64eda5c9b7cb0c9c30b5' 
  AND token = '+7mRK0o6mQFZk8BStTdOnlSE0DluXgQK7oqZXOx7dEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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