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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9af6be8880ecdcb4910ea80aa140a99454650d4de669d71cf3db1a38576fd4e0' 
  AND token = '5ccv6K+Bwlz+8aMUXq9Ioh+qbFG3PSjcwyTF4llBvbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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