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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4faac0a87597e0de2a513ebfc82158d58491774a1d3daa68d8b7ce1e6ef598be' 
  AND token = 'pJlm5/sJ8neuVZFUmy9VjU//f9WcvV1wzTcFgtUOzq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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