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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd762e42db1b98a5a75ec72015b2da5b4650c95c20baa4397769e4566ba636da7' 
  AND token = 'z7DfDHsUp2V3BDKJX2gbr8ItyM4j2yRsvdt0CfQq1wk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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