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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94e6d0b4716eae5007ee2da89bbcb7c8d0eda3d32430fccc6f64bc5f3f5c2690' 
  AND token = 'pHmi+dv+s17QMbC8fkcHBwruxR1xCgJkiVKQOnIcNJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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