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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '203e66ad55c600749d2a14569900a3bfa8948efd0c20cb36ac1fbd0062ad8b5a' 
  AND token = 'zMfrFHvHJhvzsatsUR4b9+L0PH04iK72s0q4nR/9aCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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