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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd7a3ad59075af2347a233cda237c4138846498577501d4a9aedfa1ea84b01c3' 
  AND token = 'r1NIH+cTEA77SZ7JV87mJnc8JNLssfAQdalBKbp8Ynk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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