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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7e97e79c0b48cc1396d05e9081ce5b6c26d02d310c0b2843a2e809080e1bb1c' 
  AND token = 'QzyrqyaGKAPehFU41lU/0Cl50SJSTr3tUL2ZHH8yvOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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