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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '538d637d20738d07bb5c5231e87b07e19aa2c9819e051d3637fa851ce25ed8da' 
  AND token = 'TI3vppMOSYFQhvQ/CK5AlXjG/JaoBxvn12yn26XezgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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