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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '112eca5cd5ff7533c42d6d164801afbe7def8ad16817ecdf92672e10f667cd5d' 
  AND token = 'Cr48VyHi7os9AiRkNBr7WZJ/csVPbhacPKQV7c3sbco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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