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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'def8668d9ab58f0a342635932687dfa56eb662733ff9ad4cbb8678d3820f8330' 
  AND token = 'S20hTyaUcJWyFtLnriKQZ2NCvRMRWYkp2bz8fEA0cy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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