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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '391c738674f2dd867e10d64138d7241c1152635601fe79f8d8184508d46564a3' 
  AND token = '+voSDopOUxBJcq8ClBlAEptmYhxwTNH34ieXiO16hdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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