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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29f3a98d8eb58565e40e41b3bd60c107dd992c352f687793d17e4bf07810fa91' 
  AND token = 'qbdIi/95SAFzxmmEvqoWq/ZMppW2kEc3EO+PG/6UHGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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