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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4f140721d471009c714f8e06a9a3f064495a99b1bb763f3c297c07c75218b0b' 
  AND token = '5Ud/h47gUZ4PB+Ab9k70esnrk/3JCvlrUS9HmgotGqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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