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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02d5326318ccc1aa130640ddc3542ba5db3a137357675b41ff7f5b540d405fd0' 
  AND token = 'kIFi4YG180HgoA2kSPUnpvnkZEpBU7+2T63EJTy9Lco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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