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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2b2eb1fcfca09abb28eea63eb26ae5fc9654da67e3a0ec74f44ba439ad34fc1' 
  AND token = 'skpmrE7Aen3flVcX1CCpPOu9hhyBAs70f+EwVlPK0S0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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