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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3720e57ed0c53575e284fecd9a8a13656d4557ca6717200b88eb7963cc176e5c' 
  AND token = 'sWps4SDbltb7EimUpPEh0hfPySy/OzjCu76NrovnRes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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