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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '732c8efe8ac4be8e26f305b131d364246d9b57909e9736c875758e6129c00d4c' 
  AND token = '0oIVLLdPPQg40fZMkc648Sr+XQgIh0u5U6a3UT+aNX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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