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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4d2a5a1dcc26e3ccccb59f8afcf0feabc1f0061287e6a92da791882203cd4f2' 
  AND token = 'Ld7hqsKtVGmTkb8PQy2Pvf8aANd8Bln2FiRUoE/lKmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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