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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb42d330761ca410e21f1c0722978b80c4782b5d38c01700e7df1aa62e628726' 
  AND token = 'cqqjeHxq54wH0n4A05jnP7eCKduM7gL9cvtyBGHFOWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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