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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d7992942c79704ecf6c308c3e7446da1801df9e0e2d686476327dfd7124561b' 
  AND token = '7uSnaCqGW8ju7ua0phPVmIy4//S0jmorQNdwijr3290=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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