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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53d78b71866d5c37f2ed1afb15c005ae38ddb5a4291afa3a27b0b4e1f2c884a2' 
  AND token = 'eu2wj4H5+lwQP9iAmapiurpEnAAC/emPsd5jwNPEuds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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