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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c71a9ba088503644fc0c341eedaf29df584df5d869098d2b129570f7f8a78142' 
  AND token = 'gjkZyx03ZNOT8kwQF+TXFF8JOQuF5n+52JWjFQ9xR6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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