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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66050f2014118eef7b6ccbdb64d1ca048e71288dd9dac476f3f9d0d0fe736e5b' 
  AND token = 'XU895BsNS4Yhxe0Qr/8W0NytYiMO7S9Tm4ulagWmSyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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