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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7fbbaec86f492e03843d5f11cc3e206d84ce3a64d4c7b3198542ab63ae755bc' 
  AND token = 'mMMbj8GLXxszP6eRvgJRB3wFCatApD0WORGTThwkh3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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