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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beccaf40fcdf94da423694fd587f4fcb72911ba2103c0bcd1fe109f5bd848fa1' 
  AND token = 'BRG4rQZPLfLBiuBZikT3kXIahKv1Q9StNWvUCsz0dLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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