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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7ae86627f4285d1621c9cfe9430aa9a78f82e29a3a83f9d806fe4ee40bb42d2' 
  AND token = 'gasRkUDJtvRpomU1Ctv1IkeHWCjDecyXTdpsJsgaKJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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