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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3079f1c0ce728f1f0f8f6893c70222cdabc5b3ece069971c616bbffe3eb3be5' 
  AND token = 'A/GVxsbQ6XFI+61LuDqF5gfU2qroC7GfZN2leEjOyg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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