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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbf8b0df3651f0232ca5f97ffc8b24b92d811bcc97f6a15cd11ac65c4b002139' 
  AND token = 'DvPpXsT0LbfIxT3Rlr4hV9DYW5eMxk33NnCq20a54LA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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