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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a0c40b7d86768c2f6c9496d527fc821c51933ef35a359e8d4d20a4326fe3f39' 
  AND token = 'fHcYV7lzEA4XIHDqv4s24PZAbMtS9uhr+KQX97E1ML8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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