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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdd678c610a0b84555ef1f5e864765cc032d95cd10095c058e6900175fc888f7' 
  AND token = '0DfFhHCZvzvbrLDLSuo6To31vk5lnEf6S2QHexZfN5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

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