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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a78ce6692f6bb5f8a29452fb8922a3e2ecd821761c5b713c381fac4bbf832c67' 
  AND token = 'QmoZXv+IMsQnp2Q4fD7jqzN3c+YYy0Fh4kvAl5Aa+yE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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