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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20a51ca19a3bbcad0380b92a30e0524ba7c2a9edf821e5b1e02e46f8520f70ca' 
  AND token = 'APi0/qmARxqizb07znbpLTPkr/AUg/ajeHLmwBsjmBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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