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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f22d1c5f0127789cccb6bba567684497f9bbf7045f199da1fc91b87c6a7bd88' 
  AND token = 'hCXG0tFEYsQVSWeWLXr82CPXzGzYSkC2PjXTXTWXxGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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