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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b65777ca48802852ec08b09e742d5d19b03a5b1e7ec1b0bfc5afb1ef7f52bf1a' 
  AND token = 'S3ZoMiiH22OxZ2FCljZNJUdafDgRXWWF0D58bjirJ28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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