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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e59fc0f969128afd7614123c9b1db8a53054dadc39f4294323f6cc1d01221104' 
  AND token = 'ne4iDgTKQZaHZ1tZUmNnCbok+kkZpyNVubr/saLWm+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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