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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d657e92faf373e6ab2610b69a4d3e5df189e7dc9ff74ef9ed23de15023739aa' 
  AND token = 'DR74lY4L0eqXSn/XDcqNlDExRq4zkIOHPo7X8CNauOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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