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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb88bcf4b2804ec21fbebb7e4574a0a5d09f8cdc0bdc9a27226dc1a87ba6072f' 
  AND token = 'aznnBNHdpf8Z2h4Lg0S4JxZB/HTKgPffjM4M/2fqvNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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