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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f5d3f0c6a347c8e42c38a3438b8f900c36b0384e76cd8b2cf188d5e6bf1abf9' 
  AND token = 'pJPR8O9JrLWL23rBkiXjxkJvJUIAvk8NeGUtfp5cnoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00100

JSON explain

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