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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dc9516fe60ff9e8064c7df4c412667742d80d76278cfa629a00ea8090e63291' 
  AND token = 'dwRaHT25/tiJic1BrbXE/Bk5kucF0gV1t7a6k/c4Oo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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