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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a23fba26b240ee9484eb66b3ba7bb7f259bcd1b14b437a81d1abbd597c38a030' 
  AND token = 'YyLiRRYLQK4lI2ruKknnNH+9m4LLN2lnuywUbyGXe2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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