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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29349585f238a1b0e74d7a66a036df9f50a801b4a4f0ecda1203c88f5c2a09e0' 
  AND token = 'poLeS3eBMNHGJzwNkVqXm7fPTZ/2iXVmfP7J5Ia4EAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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