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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd32b27a427b7173bc5f39f1fb97550000582fc5dd91aa68d00b849c1f6a892c5' 
  AND token = 'hPwEm20udKl6ya/kbiTMNYqWyFIYIVsKG2bi+y+ptno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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