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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd7a1256c02377c6a9b38b32333df1e92c7eb8cd092001385c65bb505c65f93e' 
  AND token = 'vP5Jx7wK/ekECWOgEilHhzi+uMVvadRawnU40TN3i48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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