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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e4fe0f5874602c8c97b4779f15c9f1caf91bc07aaf231fe8c50abe076f230f6' 
  AND token = 'BX62aHCujGp+LOvIe+WcKirnPwXZ5K4yfF2hyCkqpP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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