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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c11bde3a990b30e1f2dc4c63385f610581fcadc1a5929a4de8bebfc38cf29e2' 
  AND token = '/2op/Gvs8OBd/8NMFFqJXfvqT1giO0N2hNNh5DKLrC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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