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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c029cb271386c61295ccdec258c5e5aefbd1263bd4e8aaa542c9b8d94661b6e' 
  AND token = '4+iSaZ0my5vtAKW1MPQw5rZFtKQE7K8Pz1DYi4O+6qU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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