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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2815ed8ee5c4f599b54a371caa6828d7501d92f24d0e975f58fafe463a68bd79' 
  AND token = 'fj8pewvXPulyssRZNp/wJb/IQf1yuNT92rNziecn9VQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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