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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d3fa830f7360e1621f1f7bf974930af5e0b7af09c780bd2cb4f67379f01c65c' 
  AND token = '2h2mbM3S5cpg1Q4e4U6m03aKersXDDR6h/63/+Mq59Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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